Method of punching and bending pulley-arms.



7N0 845,711. PATENTED FEB. 26, .1907.

J. A. KAPLAN. METHOD OF PUNGHING AND'BENDING PULLEY RIMS.

APPLICATION I'ILED'I'EB. 15, 1908- FIG. 3 v 4l!lil|!|V FIG. 4

WITNESSES. Wgm lNVENTOR.

UNITED STATES PATENT OFFICE.

JOSEPH A. KAPLAN, OF PITTSBURG, PENNSYLVANIA, ASSIGNOR TO JOSHUA RHODES, OF ALLEGHENY, PENNSYLVANIA, AND WILLIAM H. LATSHAW,

OF PITTSBURG, PENNSYLVANIA.

METHOD OF PUNCHING AND BENDING PULLEY-RIMS.

ire-845,71 1.

Specification of Letters Patent.

Patented Feb. 26, 1907.

Original application filed July 10,1905,Seriel No. 269.071. Divided and this application filed February 15, 1906. .Seriel No. 301,208-

.To all whom it may concern.

Be it known that I, JOSEPH A. KAPLAN, a

resident of Pittsburg, in the county of Alle- My invention relates to the method of making ulley-rim sections for pulleys and the like f fom rolled plate metal. The object is to provide for the forming of such rims with speed, accuracy, and economy.

The a plication is a division of my appli cation ed July 10, 1905, Serial No. 269,071.

The invention consists, generally stated, in making these pulley-rim sections by first unching or otherwise forming the spokelioles in the plate composing the rim-section and then countersinkmg the outer faces of the spoke-holes by forgin pressure through the action of countersin ng-punches, the preferred course being to first punch the spoke-holes and then turn the plate over and by such countersinking action both remove the fin formed by the punching and form a hard and smooth countersunk seat on the outer face.

It also consists in so forming the plate composing the rim-section and then simultaneously bending the plate into semicircular form and crowning the pulley-rim, such as by rolling the same to sha e.

In the accompanying rawings, Figure 1 represents the first step in the punching of the spoke-holes in the late and forming the rim-section. Fig. 2 il ustrates the countersinking of said holes. Fig. 3 is an enlarged section illustrating the condition of the plate after punching and showing the fin formed. Fig. 4 shows the resultant action after the plate is turned over and subjected to the countersinking-punch. Fig. 5 shows the step of bending and crowning the previously punched and countersunk plate, and Fig. 6 shows the crowned pulley-rim.

The invention is illustrated in connection with the forming of rim-sections for sectional pulleys in which each rim-section constitutes one-half of the complete rim. The rim-sections are formed from metal plates 6 of the necessary gage, width, and length to form the desired pulley-rim, being preferably cut from commercial rolled plates of the neces- ,sary gage and width. In each plate the formed in any suitable way, this being done most cheaply by punching, as illustrated in Fig. 1. The plate 6 is placed upon a bed-die .8, and the reciprocating punching head or number and sospaced apart that at a single spoke-holes are formed'in the plate. In this punching, as illustrated in Fig. 3, fins or holes on the opposite side of the plate, as at 11. The metal is also left slightly ragged or porous at this point.

By means of the next step of the method I am enabled to not only form the countersinks but to entirely remove these finned, ragged, or porous edges around the spoke-holes. To this end theplate is then turned over, so as to bring upward the face of the plate. which forms the outer face of the rim-section, and

forging action of the countersinking-punches 12, as shown in Fig. 2. These unches may, if desired, be attached to the p aten or head 9 of the press which carries the punches 10, and the plate may rest upon the same beddie 8, it being necessary snnply to turnover the plate upon that die and bring its punched holes in line with the countersinking punches or dies 12, as shown in Fig. 2. As the platen of the press descends these counterslnking punches or dies are forced into the spokeholes and by a forging pressure force down the metal and forge the tapered countersinks,

very hard smooth countersun seats by a simple quick stroke of the press. In so doing in case the spoke-holes have been punched, as above described, such countersinking strokes also obliterate all fins, ragged, or porl ous portions formed arourd the edge of the hole by the punching action, and this provides a very rapid and cheap means for ro- (lucing the punched and countersunk p ate tions. In the rapid finishing of these pulle s I I prefer at one operation to both bend t e l pulley-sectionsinto semicircular form and inecessary number of spoke-holes 7 are platen 9 carries a series of punches 10 of such blow of the press the necessary number of' or seats on the outer face of the pulley-rim,

the punched holes are then subjected to the ready for bending into pulley-rim or like sec-' ragged edges are formed around the punched such as that shown at 13 in Fi 4, forming crown the same, producing at one operation the finished crowned. pulley-section from the previously punched and countersunk plate. For this purpose I prefer to employ the rolls shown in Fig. 5, comprising the bending-roll 14, a pair of anvil-rolls 15, which are made of comparatively small diameter to form two points of support for the plate very close to each other and which are backed and stiffened by the bottom roll 16. As illustrated in the drawings, in order to crown theplate as Well as bend it the upper bending-roll 14 is formed slightly convex, While the anvil-rolls 15 are formed slightly concave, corresponding to the desired crown to be imparted to the plate during bending. The'rolls of course are arranged to be adjusted to suit the desired diameter of pulley-rim to be produced, it being foundthat by the adjustment of rolls of this character I am able to roll pulley-rims to accurate curve and of practically anydi ameter. This bending operation is performed cold, so that the finished pulley-rim will not shrink or warp and will remain of the same true semicircular shape an d of the exact diameter for the production of which the bending-rolls are adjusted. In this bending operation it will be seen that the bending pressure is applied in such way that instead of closing up or distorting the countersunk outer faces of the spoke-holes formed in the pulley-rim it stretches the same in all directions, and so while slightly enlarging such countersinks preserves them of proper. form, even though theblank is bent as shown after such countersinking action.

hat I claim is 1. The herein-described steps in the.1nanu facture of pulley-rim sections and like articles, consisting in first punching spoke-holes in the plate composing the rim-section, and then turning the plate over, and countersinking the outer face of the spoke-holcs by forging pressure by the action of countersinkingpunches.

2. The herein-described steps in the manufacture of pulleyrim sections and like articles, consisting in first forming spoke-holes in the plate composing the pulley-rim section, countersinklng the outer faces of the spoke-holes by forging pressure through the action of count ersinking-punches, and then simultaneously bending the plate into curved form and crowning the pulley-rim.

In testimony whereof I, the said JOSEPH A. KAPLAN, have hereunto set my hand.

. JOSEPH A. KAPLAN.

Witnesses ROBERT C. ToTTEN, J. R. KELLER. 

